cache-busting for homepage images

lib/template.php

@@ -109,6 +109,10 @@ function buildcommon() {
 		array_map('imagedestroy', $handles); // free
 	}
 	
+	// Cache-busting stylesheet
+
+	$style = '.homeimage-sprite { background-image: url("logos.jpg?'.md5_file(BASEDIR.'wwwroot/logos.jpg').'"); }';
+
 	// Build index page
 
 	ob_start();
@@ -120,6 +124,10 @@ function buildcommon() {
 		<!-- }} --> 
 	<?php } ?> 
 		
+		<style type="text/css">
+	<?php echo $style; ?> 
+		</style>
+
 		<table id="projtable-main" class="projtable">
 	<?php foreach ($plist as $i => $pr) { ?> 
 			<tr class="<?=$pr->getClassAttr()?>"